/**
 * localStorage中保存商品的方法
 */

 const KEY = "goods"
 const KEY2 = "goodsCount"

 export const getGoods = () => {
     //从localStorage中获取内容
     const goodsObj = JSON.parse(localStorage.getItem(KEY) || "{}")

     return goodsObj
 }

 /**
  * 传入进来的参数 {goodsId:87,count:3}
  */
 export const saveGoods = (goods)=>{
    //goodsObj中存储的数据如下  {87:3,88:2}
    const goodsObj = getGoods()

    if(goodsObj[goods.goodsId]){
        goodsObj[goods.goodsId] = goodsObj[goods.goodsId] + goods.count
    }else{
        goodsObj[goods.goodsId] = goods.count
    }

    //存储起来
    localStorage.setItem(KEY,JSON.stringify(goodsObj))

    //获取总数量并且返回
    return getTotalCount()
 }

 //更改商品的数量
 export const updateGoods = (goods)=>{
    //goodsObj中存储的数据如下  {87:3,88:2}
    const goodsObj = getGoods()

    goodsObj[goods.goodsId] = goods.count

     //存储起来
     localStorage.setItem(KEY,JSON.stringify(goodsObj))

     //获取总数量并且返回
     return getTotalCount()
 }

 //根据id删除对应的商品
 export const deleteGoodsById = (goodsId) =>{
     //goodsObj中存储的数据如下  {87:3,88:2}
     const goodsObj = getGoods()

     delete goodsObj[goodsId]

     //存储起来
     localStorage.setItem(KEY,JSON.stringify(goodsObj))

     //获取总数量并且返回
     return getTotalCount()
 }

 /**
  * 获取总数量
  */
 export const getTotalCount = () => {
    const localGoods = getGoods()
    let totalCount = 0
    for(var key in localGoods){
        totalCount+=localGoods[key]
    }

    localStorage.setItem("goodsCount",totalCount)

    return totalCount
 }